2021 Audi S4 problems, complaints & recalls
Most-reported problem areas: Electrical System (1)
🧭 Reliability snapshot
Compared against other Audi S4 model years — complaint volume vs the model's median year, recalls and severity. How we score →
Safety recalls (4)
Back Over Prevention:display Function 2022-10-05 · campaign 22V742000 · 170,296 vehicles
Defect: Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Audi A8, RS7, RS6 Avant, RS5 Sportback, RS5 Coupe, Q8, Q7, Q5 Sportback, S4 Sedan, Q5, A7, A6, A6 Allroad, A5 Sportback, A5 Coupe, A5 Cabrioleet, A4 Sedan, A4 Allroad, E-Tron Sportback Quattro, SQ7, S5 Cabriolet, E-Tron Quattro, SQ8, SQ5 Sportback, SQ5, S8, S7, S6 Sedan, S5 Sportback, S5 Coupe, 2022 E-Tron GT, and 2021-2022 RSQ8 vehicles. Due to a software issue, a blank or black screen may be displayed instead of the rear
Risk: A blank rearview camera display can reduce the driver's rear visibility, increasing the risk of a crash.
Fix: Dealers will update the infotainment unit software, free of charge. Owner notification letters were mailed October 25, 2022. Owners may contact Audi's customer service at 1-800-253-2834. Volkswagen's number for this recall is 91DZ.
Tires 2022-01-26 · campaign 22V034000 · 31,058 vehicles
Defect: Volkswagen Group of America, Inc. (Audi) is recalling certain 2019-2021 Audi A5 Sportback, RS5 Coupe, RS5 Sportback, S5 Sportback, 2020-2021 A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A6 Allroad, A6 Sedan, A7, A8, Q5, S4 Sedan, S5 Coupe, S5 Cabriolet, S6 Sedan, S7, S8, SQ5, 2021 Q5 Sportback, Q7, Q8, RS6 Avant, RS7, RSQ8, SQ5 Sportback, SQ7, and SQ8 vehicles. The rear axle alignment may not have been inspected after the repairs for Recall 21V-295 (42L1) were performed.
Risk: Rear axle misalignment may cause premature or uneven tire wear, increasing the risk of a crash.
Fix: Dealers will inspect the rear axle, adjust the alignment as necessary, and replace any prematurely or unevenly worn tires, free of charge. Owner notification letters were mailed March 3, 2022. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 42L5.
Seat Belts:rear/Other:retractor 2021-08-05 · campaign 21V606000 · 45,496 vehicles
Defect: Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Volkswagen ID4, Audi A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A5 Sportback, A6 Allroad, A6 Sedan, A7, A8, E-Tron Quattro, E-Tron Sportback Quattro, Q3, Q5, Q5 Sportback, Q7, Q8, RS5 Sportback, RS5 Coupe, RS6 Avant, RS7, RSQ8, S4 Sedan, S5 Cabriolet, S5 Coupe, S5 Sportback, S6 Sedan, S7, S8, SQ5, SQ5 Sportback, SQ7, SQ8, and 2021-2022 S3 Sedan vehicles. The rear seat belt automatic locking retractors may deactivate ear
Risk: An unsecured child restraint system can increase the risk of injury during a crash.
Fix: Dealers will inspect, and replace as necessary, the middle-rear seat belt assemblies, free of charge. Owner notification letters were mailed August 27, 2021. Owners may contact Volkswagen customer service at 1-800-893-5298 and Audi customer service at 1-800-253-2834. Volkswagen's numbers for this recall are 69CR (VW) and 69CS (Audi).
Suspension:rear:axle:non-Powered Axle Assembly 2021-04-26 · campaign 21V295000 · 40,993 vehicles
Defect: Volkswagen Group of America, Inc. (Audi) is recalling certain 2021 Q7, Q8, Q5 Sportback, SQ5 Sportback, RS6 Avant, RS7, RS Q8, 2020-2021 Audi S6 sedan, Q5, A8, S8, A7, A6 Allroad, A5 Cabriolet, A4 sedan, A4 Allroad, SQ5, S7, A6 sedan, S5 coupe, S4 sedan, S5 Cabriolet, A5 coupe, 2019-2021 RS5 coupe, A5 Sportback, S5 Sportback, RS5 Sportback vehicles. The lock nut on the trailing arm of the rear axle may break due to stress corrosion.
Risk: A broken lock nut may misalign the rear axle, causing a loss of control and increasing the risk of a crash.
Fix: Dealers will replace the lock nuts and, if necessary, the associated bolts, free of charge. Owner notification letters were mailed June 4, 2021. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 42L1.
Service bulletins (969)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Unknown Or Other 2026-09-25 · TSB_2083409_1 · Service Bulletin/Repair Instructions
this bulletin states that technicians are required to report to the manufacturer when a vehicle has flooded, and specify the height to which the vehicle has been flooded.
Unknown Or Other 2026-09-25 · TSB_2052680_2 · Service Bulletin/Repair Instructions
this bulletin provides information for reporting safety related information to the manufacturer.
Steering 2026-09-22 · TSB_2074846_5 · Service Bulletin/Repair Instructions
this bulletin provides information about vibrations and rotational steering vibrations.
Steering 2026-09-22 · TSB_2065871_4 · Service Bulletin/Repair Instructions
this bulletin provides informaiton when dtc b200ff0 is stored.
Visibility/Wiper 2026-09-22 · TSB_2020552_15 · Service Bulletin/Repair Instructions
this bulletin provides service information regarding exterior glass cleaning.
Structure:body 2026-09-18 · TSB_2078648_4 · Service Bulletin/Repair Instructions
this bulletin provides information about billing for a broken sunroof glass panel.
Showing the 6 most recent of 969 bulletins. Search all of them free at nhtsa.gov.
What owners report
2025-09-25 · Electrical System · 31,000 mi“the contact owns a 2021 audi s4. the contact stated that while driving at an undisclosed speed, the vehicle experienced a loss of automotive power. the check engine warning light was illuminated. the message "drive system malfunction - please contact service" was displayed. in addition, the vehicle hesitated to restart and shift into gear as intend…”
2023-01-31 · Unknown Or Other“2021 audi s4. consumer writes in regard to nhtsa safety recall 22v-742. the consumer is disgusted and disatisfied with the audi service department procedures for performing the recalls.…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.